
.header_left {
    float: left;
    user-select: none;
}
.header_left::after {
    content: '';
    display: block;
    clear: both;
}
.header_item {
    float: left;
    padding: 0 16px;
    color: rgba(255, 255, 255, 1);
    cursor: pointer;
}
.header_item:hover {
    color: rgba(255, 255, 255, 1);
    background-color: rgba(55, 55, 55, 1);
}
.header_item.current {
    background-color: rgba(235, 235, 235, .2);
}